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Drought Watering for Mature Oaks: Survival Irrigation Formula

For drought-stressed oaks, apply "survival watering": 2 gallons per inch of trunk diameter (measured at 4.5 ft) per day since last watering. Example: 10-inch diameter tree, 7 days since rain = 140 gallons (2×10×7). A typical sprinkler delivers 5 gal/min → 28 minutes. Distribute evenly under and slightly beyond the canopy.

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